Sharpener for slicing-machines.



A. R. LUSCHKA AND J. FOLK.

SHARPENER FOR SLICING MACHINES.

APPLICATION FILED MAR. 23. I9I8.

Patented July 1, 1919.

ZSHEETS SHEET I.

A. R. LUSCHKA AND J. FOLK.

SHARPENER FOR SUCING MACHINES.

APPLICATION FILED MM 23. 1918.

Patented-July 1, 191.9.

I ZSHEETS-SHEET 2.

J4 JJ WITNESS M/VE/VTORG.

States, residing UNITED STATES PATENT OFFICE.

aueus'r n. LUSCHKA AND JOSEPH FOLK, or LAPORTE, smcme MACHINE column, or naronrn, Iii-mane,

INDIANA, ASSIG-NORS TO "U. S. A. CORPORATION OF INDIANA.

-- SHARIENER FOR SLTGING-MAGHINES.

- which sha 1 be of improved construction and lit ' showing one embodiment of the vention.

w the accompanying operation.

The invention is exemplified in the combination and arrangement of parts shown in drawings, and described. in the following specification, and it is more 'OlitlIIlS. In the drawin s,

Figure 1 is a side elevation of particularly pointed out in the appended present [in- Fig. 2 is a top shown in Fig.1.

Fig. 3 a vertical sectional view on line Fig. hor1-izontal sectional view on plan View of the sharpener s a line H of F1 Fig. 5' is a orizontal The knives 5f slicing machines must be kept constantly sharp in order to perform the best work, and',since they are circular disks ofconsiderable size, it is have a" grinder so mounted upon the machine that the sharpening operation can be i performed automatlcall It is also desirjusted able that this grinders all be so arranged that it cannotbe moved into "and out of engagement with the knife in such a manner that the edge'of the knife will be in-' jured. "In the drawings, the numeral designates a bracket securedto the ,framework 11 of the slicing machine, the bracket 10 carrying. a post 12 position in the bracket by means -of a set screw 13. The post 12 carries a circular disk' 14 rigidly secured thereto which forms a table for supporting the mainframe or hearing block 15 of the grinder. The block 15, as shown in Fig; 3, is vertically .1 bored at '16 to receive the up er end of 55 the post 12 upon which the bloc may be slid Specification of Letters Patent.

- block isin its ;horizontally to form a sharpener; pair of collars and 26 are mounted for sectional view on desirable to I which is held in ad 5 be rocked upon its Patented July 1, 1919..

application filed March 23, 1918. Serial No. 2%,216.

vertically and also swung laterall the post 12 forming a pivot for the lateral movement. A detent 17 is fastened to the block 15 by screws 18 and carries at its lower .end an inwardly bent finger 19 in position 60 to engage the under surface of the table 14 to limit. the upward movement of the block 15 upon the post 12. A series of notches 20, 21 and 22 is formed in the periphery of the disk 14 and a projection 23 6a is inwardly struck from the detent 17 for engaging these notches to prevent rotation of the block 15 about the post 12 when the lowermost position. When the block 15 is raised from the notches in the disk 14 and the block with its grinders may then be freely swung about the post 12, as a pivot.

The upper end of a bearing 24 in which longitudinal sliding movement. The collars 25 and 26 are in turn centrally bored to. form bearings for a lars 28 and 29 at its opposite ends arranged -to form shoulders against which the. grind Y ers 30 and 31 are respectively held by nuts 32 and 33, threaded onto the outer ends of the shaft.- The c0llars 25 and 26 are re- 85 siliently forced outwardly against the inner. ends of the collars 2S and 29 y a coilsp'ring 34 surrounding the-shaft 27 and having its ends arranged to bear a ainst the 1 inner faces of thecollars 25 an crs 30 and 31 may be provided with guards 35 and 36 if desired.

The bearing drawings, and a screw 38 is 38 passes through an opening. in the end ofa link 39 which has its opposite end pivotally. connected with a lever 40 by means 10c of a screw 41. The lever 40 is rigidly connected by a screw 42 with a pin 43 extending transversely through the block 15, as

shown more clearly in Fig. 5, and the upper endof the lever A piece 44 by means of which the lever may pivotal support formed A coil spring 45 surrounds.

by the pin 43.

pin 43 oppositeflthe lever 40 the end of the and has one and connected with the pin 110 w to its uppermost posh 7t tlon, the pro ect1on 23 will be'withdrawn the block 15 is bored shaft 27 which has colso 26. .The' grind- .90

portion of the block 15 is I Slotted, as shown at 37 in Fig. 4 of the threaded into the collar 25 and projects outwardly through i .the slot 37. The outer end of the screw is provided with a finger 10a 43 and the other rigidly held by the block 15 so that the spring normally tends to rotate the pin 43 and the lever 40 in a clockwise direction, as viewed in Fig. 1. A catch V bar 46 is pivotally mounted at 47 on the upper portion of theblock and is provided with notches 48 for engaging an overhanging projection 49 on thelever 40. A

. J spring 50forces the catch bar 46 upwardly 10 into engagement with the projectlon 49. A

finger piece 51-is provided for pressingthe catch ,bar downwardly against the spring I 50 to release the lever-from the notches 48.

As shown in- Figs. 3 and 5, the openings. '15 for the pin'43 and the post, 12 are so formed that "they partially intersect one another.

The pin 43 is partially cut away tov form anotch 52 so that the pin will free the post 12 when it is turned into a position to bring the face of the notchin a vertical plane.

The parts are so. related that this occurs when the lever 40 is thrown to its extreme position, as shown in Fig. 1, by the spring 45. The post 12 is also cut away to pro- 1 vide a peripheral notch 53 which lies adjapin 43 while in this position also. A post 54 is connected with the upper portion of the block 15 and carries a knurled head 55 by means of which the block with its connected parts may be raised and lowered and swung about the post 12. The post 54 is preferably bored centrally to provide an oil duct for lubricating the various parts of the grinder. A fragment of the knife to be sharpened is shown at 56 in'Fig. 3 of the drawings.

Assuming that the parts are in the po siv tion shown in Figs. 1, 3 and 4 of the drawings, the grinder 31 may be'brought into engagement with the beveled portionof the knife 56 by moving the lever 40 to the left in these figures until itengages one or the other of the notches 48 of the catch 46. This movement of the lever 40 will cause the collar 25 to bear against the end of the spring 34 and the pressure thus exerted will be resiliently transmitted to the collar 26 i and so force the shaft 27 to the left, as seen in the figures in the drawings to bring the grinder 34 into engagement with the slicing knife. The grinder is resiliently held in this position by the engagement of the notches 48 60. with the'lever 40 while the knife 56 is rotated by the mechanism of the slicing machine to perform the grindin operation. This grinding operation will bring the knife to a sharp edge, but will leave a bur on the side of the edge opposite the bevel. To reagainst the knife.

the knife.

move the bur the grinder is raised and rotated to bring the disk 30 into engagement with the fiat surface of the knife. It should be noted that the steps in the changeof the position of the grinder must occur in proper sequence to prevent injury to the knife. If the grinder were raised while in Contact with the knife, the spring 34 would force the disk across the edge of -'the-knife when the disk is raised to a point where it clears the knife. Such upward movement of the grinder is made impossible, however, by the fact that the pin 43*is rotated to bring a ortion of the pin beneath the upper shou der formed by the notch- 53 during the time that the lever 40 is in nosition to hold the grinder Before the grinder can be raised, it is necessary, to release the catch 46 and permit the lever 40 to return under the influence of the spring 45 to its inoperative position. This return movement of the lever 40 will carry the collar 25 and consequently the grinder disks into their retrac'ted positions, as shown in the figures of the drawings. The grinder is now free to move upwardly and after it has been raised to clear the edge of the knife 56, it may be swung about the post 12 to bring the disk 30 into position adjacent the knife. It

should be noted that the swinging move ment cannot take place until the grinders are raised high enough to clear the edge of the knife, because of the engagement of the struck-in portion 23 of the detent 17 with the notches in the disk 15. The grinder cannot again be lowered unless the projection 23 is brought into position to register with one of the notches in the periphery of the I disk 15. These notches are so positioned that when the projection 23 registers with any one of them, the disk 30 will be in a position to clear the knife 56 when the grinder is lowered. One position is provided in which'the grinder 31 will be adjacent the knife 56, another in which the grinder 30 I will be adiacent the knife 56, and a third in which the shaft 27 will be parallel with the plane of the knife and both grinders will be in a neutral position. When the grinder has been raised and rotated to bring the disk 30 adjacent to and above the knife 56, it may then be lowered to bringthe disk opposite the upper edge of the knife. In the retracted position shown in Fig. 3 of the drawings,

the disk 30 is farther from the axis of the post 12 than is the disk 31 so that when the disk 30 is lowered, it will be outside of the edge of theknife 56, or to the left of the knlfe, as viewed in Fig. 3, and may be drawn inwardly toengage the flat face of the knife by a movement of thelever 40 similar to that used for focusing the disk 31 outwardly int-o engagement with the beveled edge of The same resilient contact between the grinder and the knife will be pro- I duced as in the former case because the force operating position, such lowering of the grinder would be prevented by engagement etween the pin 43 and the upper end of the post 12. This prevents movingthe grinder downwardly into contact with the upper edge of the knife and thusmarring the-edge.

. It will-be apparent thatagrinder is thus provided which may be operated to grind the beveled edge of the slicing knife and sub-- .15

sequently remove the bur formed by the grinding operation, the parts being so related that an exact sequence of movement 7 must be carried out, in bringing the grinder into and out of operating position. In this way' any movement which would cause marring of the edge of the slicingkmfe 1S automatically prevented.

We claim:

1. A sharpener for slicing machine 'knives' comprising a spindle having grinders carried at the opposite ends thereof, means for shifting said spindle to bring either of said grinders into'position adjacent the 'kn1fe to be sharpened, a spring for resiliently holding said grinders in engagement with said knife, and a device for exerting pressure on said spring and for positively shlfting said, spindle to move said grinders out of engagement with said knife.

2. A slicing machine comprising a spindle having a grinder connected with each of the opposite ends thereof, means for shifting said spindle to bring either of said grinders into a position adjacent said knife, a spring for holding said grinders against said knlfe, and means for positively moving said grinders away from said knife. i

3. A sharpener for slicing machine knives comprising a grinder, means for resiliently moving said grinder into engagement with said knife, means for positively moving said grinder out of engagement with said knife, and mechanism for controlling the directionof movement of said grinder toward said knife to prevent injury to the edge of said knife.

A. A sharpener for slicing machine knives i comprising a grinder, a spring for-resili- 'ently pressing said grinder against a knife to be sharpened, means for actuating sa d spring to cause engagement between said grinder and said knife and for positively' moving said grinder out of engagement with I said knife, and mechanism for controlling the directionof movement of said grinder toward and from said knife to prevent injurious contact between said grinder and the edge of said knife.-

5. A sharpener for slicing machine knives comprising a spindle, a grinder carried by said s indle at each of the opposite ends I collars, means for supporting said collars for movement in the direction of the axis of said spindle, and means for shifting one of said collars to cause said spring to resiliently move one of said grinders into engagement with said knife when said collar is moved in one direction andfor withdrawi said grinder from engagement with sa l d knife whensaid collar is site direction.

6. A sharpener for slicing machine knives comprising a spindle having a rinder carried by each of the opposite ends thereof, a pair of collars surrounding said spindle between said grinders, a spring interposed between said collars, means for supporting said collars for movement in the direction of the axisof said spindle, means connected with one'of said collars for shifting said collar-in one direction to exert pressure on said spring for resiliently forcing one of said grinders into engagement with a knife to be sharpened, a spring for moving said I collar shifting means in an opposite direc tron to withdraw said grinder from enga ementwith said knife, means for shifting t e position of said spindle to bring either of said grinders into operative relation with saidknife at the will of the operator, and

for swinging said support laterally about moved in the op po- I for raising and loweringsaid support and an upright axis, a platform on which said support rests when in its lowermost position, and a detent having projections thereon for limiting the upward movement of said support and for cooperating with recesses in said platform to control the angular position of said support about upright axis during vertical movement of said support.

8. lln combination, a sharpener for a slicing machine knife comprising a spindle,

grinders connected with opposite ends of said spindle, sleeves surrounding said spin-' dle and forming bearings therefor a coil spring surrounding said spindle between said sleeves and having its opposite ends arranged to bear against the inner faces of said sleeves, means for supporting said sleeves for movement in thedirection "of the axis of said spindle,- an upright axis upon which said supporting means is mounted for vertical sliding move ment and for horizontal pivotal movement,

a lever connected with one of said sleeves lever in and movable in one direction for exerting pressure upon said spring to force one of said rinders into resilient engagement with said knife and movable in an opposite direction to move said grinder out of engage-.

ment with said knife, means connected with said lever and movable therewith for controlling the vertical movement of said supporting means and the operation 'of said lever, a spring for normally holding said position to hold said grinder out of engagement with said knife, a latch for holding said lever in position to hold said grinder in engagement with said knife,

., a slicing machine knife, of means for mov- ,and mechanism for ing said grinder into and out ofiposition adjacent to said knife, means for resiliently moving said grinder into contact with said knife and for moving said grinder positively and non-resiliently away from said knife,

cont-rolling the movement of said grinder to prevent injury to the edge of said knife.

10. A sharpener for a slicing machine kni fe comprising a shaft, a pair of grinders said collar means for shifting the axis of said shaft to bring said grinders alternatively into position adjacent said knife, means for shifting said shaft longitudinally of its axis to cause said grinders to engage said knife, and a spring arranged to cooperate with said lastmentioned shifting means to impart resilient movement to said shaft in one direction but permitting non-resilient movement to said shaft when said shifting means is moved in the opposite direction.

11. A- sharpener for a slicing machine knife, comprising a shaft having a pair of grinders mounted thereon in spaced relation to one another, means forshiftin the axis of saidshaft to bring said grin ers alternatively intoposition adjacent saidknife, a collar slidably mounted on said shaft, means for shifting said collar in the direction of the axis of said shaft, a spring surrounding said shaft and engaging said collar to impart resilient movement to said shaft in the direction of the axis thereof when said collar is shifted in one direction, and an abutment for engaging said collar to impart non-resilient movement to said shaft mounted in spaced relation on said shaft,

in the direction of the axis thereof when is shifted in the opposite direction.

In testimony whereof we have signed our names to this specification on this 18th day of March, A. D. 1918.

AUGUST R. LUSCHKA. JOSEPH FOLK. 

